原码、补码、反码参考：http://www.cnblogs.com/zhangziqiu/archive/2011/03/30/ComputerCode.html进制转换参考：http://www.cnblogs.com/xugang/archive/2012/10/22/2733593.html负数转换为16进制http://blog.csdn.net/xiaochunyong/article/details/7616625--16进制数"0x7FFFFFFFFFFFFFFF"转化为进制selectCONVERT(bigint,cast(0x7FFFFFFFFFFFFFF Read More
